Local dispersal of Puccinia triticina and wheat canopy structure.
Local dispersal of Puccinia triticina and wheat canopy structure.
复制标题
小麦柄锈菌的局部扩散和小麦冠层结构。
DOI：
10.1094/phyto-99-10-1216
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发表时间：
2009
期刊：
影响因子：
3.2
通讯作者：
C. Lannou
中科院分区：
文献类型：
--
作者：
Lise Frézal;C. Robert;M. Bancal;C. Lannou
为了共同建立模拟宿主生长和疾病传播的动态模型，需要精确地描述病原体传播与冠层结构的关系。在这项研究中，我们测量了位于小麦冠层不同高度的单个受感染叶片的疾病传播。由此产生的病变分布描述沿作物行和超过三个叶层。孢子的来源，虽然限于单叶，几乎饱和的宿主表面可接触孢子。大多数病变发生在离病灶30 ~ 40厘米的范围内。源的垂直位置影响病变的分布和疾病梯度的陡峭程度。含孢子源的叶层和小麦行感染最严重。在病源附近，一些严重感染的叶片产生了陡峭的疾病梯度，而孢子扩散导致沿相邻行和其他叶层的梯度较浅。根据所需的精度，病变分布可以在叶层水平上描述，也可以通过每行和每叶层的扩散梯度来描述。
The development of dynamic models jointly to simulate host growth and disease spread necessitates a precise description of pathogen dispersal in relation to canopy structure. In this study, we measured disease spread from a single infected leaf positioned at different heights in wheat canopies. The resulting lesion distribution was described along crop rows and over three leaf layers. The spore sources, although limited to a single leaf, nearly saturated the host surface accessible to the spores. Most of the lesions were found within 30 to 40 cm of the source. The vertical position of the source influenced the lesion distribution and the steepness of the disease gradients. The leaf layer and the wheat row that contained the spore source were the most infected. Close to the source, a few heavily infected leaves produced steep disease gradients, whereas spore diffusion resulted in shallower gradients along the adjacent rows and on the other leaf layers. Depending on the precision needed, the lesion distribution can be described either at the level of leaf layers or by dispersal gradients for each row and leaf layer.